com.pervasive.datarush.operators.record

Class DiscoverDomain

java.lang.Object

com.pervasive.datarush.operators.AbstractLogicalOperator

com.pervasive.datarush.operators.CompositeOperator

com.pervasive.datarush.operators.record.DiscoverDomain

All Implemented Interfaces:

LogicalOperator

public final class DiscoverDomain
extends CompositeOperator

Utility operator for discovering the domain of string fields. Note that this is not intended to be used as a "top-level" operator; rather this is a utility for iterative operators that wish to compute their domains

Constructor Summary

Constructors

Constructor and Description
DiscoverDomain()

Method Summary

Modifier and Type	Method and Description
protected void	compose(CompositionContext ctx) Compose the body of this operator.
List<String>	getIncludedFields() Returns a list of fields to include in the discovery.
RecordPort	getInput() Returns the input port containing the string fields to convert
int	getMaxDiscoveredValues() Returns the maximum number of values to discover.
RecordTokenType	getResult() Returns the discovered result
void	setIncludedFields(List<String> includedFields) Sets a list of fields to include in the discovery.
void	setMaxDiscoveredValues(int maxDiscoveredValues) Sets the maximum number of values to discover.

Methods inherited from class com.pervasive.datarush.operators.AbstractLogicalOperator

disableParallelism, getInputPorts, getOutputPorts, newInput, newInput, newOutput, newRecordInput, newRecordInput, newRecordOutput, notifyError

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DiscoverDomain

public DiscoverDomain()

Method Detail

getInput

public RecordPort getInput()

Returns the input port containing the string fields to convert

Returns:

the input port containing the string fields to convert

getIncludedFields

public List<String> getIncludedFields()

Returns a list of fields to include in the discovery. The default value of "empty" implies that we include all fields.

Returns:

a list of fields to include

setIncludedFields

public void setIncludedFields(List<String> includedFields)

Sets a list of fields to include in the discovery. The default value of "empty" implies that we include all fields.

Parameters:

includedFields - a list of fields to include

getMaxDiscoveredValues

public int getMaxDiscoveredValues()

Returns the maximum number of values to discover. This places a cap on the memory usage in the event that the input data contains a large number of distinct values. Fields that exceed the number of discovered values will remain as strings. This is 1000 by default.

Returns:

the maximum number of values to discover

setMaxDiscoveredValues

public void setMaxDiscoveredValues(int maxDiscoveredValues)

Sets the maximum number of values to discover. This places a cap on the memory usage in the event that the input data contains a large number of distinct values. Fields that exceed the number of discovered values will remain as strings. This is 1000 by default.

Parameters:

maxDiscoveredValues - the maximum number of values to discover

getResult

public RecordTokenType getResult()

Returns the discovered result

Returns:

compose

protected void compose(CompositionContext ctx)

Description copied from class: CompositeOperator

Compose the body of this operator. Implementations should do the following:

1. Perform any validation of configuration, input types, etc
2. Instantiate and configure sub-operators, adding them to the provided context via the method OperatorComposable.add(O)
3. Create necessary connections via the method OperatorComposable.connect(P, P). This includes connections from the composite's input ports to sub-operators, connections between sub-operators, and connections from sub-operators output ports to the composite's output ports

Specified by:

compose in class CompositeOperator

Parameters:

ctx - the context